Air Operated Double Diaphragm Pump 44GPM - Heavy Duty Pneumatic

In this review of the Air Operated Double Diaphragm Pump the bottom line is simple: this pump is built for demanding fluid transfer tasks where corrosion resistance and a leak-proof housing matter most. It suits workshops and industrial sites that need a pneumatic, non-electric solution for oils, diesel and many chemicals. The single biggest reason to buy is the combination of a full-bolted aluminum alloy body and dual-layer PTFE diaphragms, which together offer rugged sealing and strong chemical resistance that helps avoid downtime from leaks or diaphragm failure.

Key Features

• Solid & Leak-Proof Design: The full-bolted aluminum alloy housing provides a durable seal that reduces the risk of leaks and eliminates the need for oil lubrication.
• Premium PTFE Diaphragm: Dual-layer PTFE diaphragms offer high corrosion resistance so the pump handles aggressive fluids and extends diaphragm life.
• High Flow and Pressure: With a max flow rate of 44 GPM and max pressure of 115 PSI the pump moves large volumes for tank transfers and bulk pumping tasks.
• Standard Connections: 1-1/2 in inlet and outlet plus an FNPT 1/4 in air inlet make it easy to install into existing pneumatic and fluid lines.
• Low Noise Operation: The included silencer lowers operational noise and vibration and is detachable for simple maintenance.
• Wide Fluid Compatibility: Rated for waste oil, diesel, gasoline, hydraulic fluids and many detergents, making it versatile across workshops and plants.

Who It's For

This pump is aimed at industrial users, automotive shops, maintenance crews and facilities that need a pneumatic transfer pump capable of handling oils and corrosive liquids without electricity. It is especially useful where a high flow rate and robust chemical resistance are priorities.

Those who should look elsewhere include operators who require quiet, precision metering at low flow rates or users who need an electrically powered unit for remote control or variable speed drives. Also consider a different design if you need a pump with reinforced support legs, as several users reported support issues under heavy vibration.

Pros & Cons

Pros

• Durable, full-bolted aluminum construction that minimizes leaks and maintenance.
• Dual-layer PTFE diaphragms provide excellent corrosion resistance for harsh fluids.
• High throughput capability at 44 GPM and useful max pressure of 115 PSI for heavy transfers.
• Quiet operation with a detachable silencer for easier upkeep.

Cons

• Some customers reported mixed functionality and broken leg supports, indicating the base or mounts may need reinforcement for very heavy or vibrating installations.
• Priming speed can be slow in some conditions, so initial setup may require patience.

Specifications

Max Flow Rate	44 GPM
Max Pressure	115 PSI
Max Head Lift	226 ft / 69 m
Inlet / Outlet Size	1-1/2 in
Air Inlet	FNPT 1/4 in
Diaphragm Material	Dual-layer PTFE
Housing Material	Aluminum alloy, full-bolted

Our Verdict

The Air Operated Double Diaphragm Pump is a practical choice for shops and industrial sites that need a high-flow, corrosion-resistant pneumatic pump. Its robust aluminum housing and PTFE diaphragms deliver reliable sealing and compatibility with many fluids, offering good value where leak prevention and chemical resistance matter most. Buyers should ensure secure mounting to avoid the reported support issues.

Frequently Asked Questions

Can this pump handle diesel and waste oil?
Yes, the pump is rated for waste oil, diesel and similar petroleum-based fluids thanks to its PTFE diaphragms and aluminum housing.

What are the connection sizes for installation?
The pump uses 1-1/2 in inlet and outlet ports and a FNPT 1/4 in air inlet for pneumatic supply.

Is it noisy in operation?
The pump includes an advanced silencer designed to reduce noise and vibration; the silencer is detachable for cleaning or replacement.